SAN ANTONIO — Immediately after pummeling a man to death last week during what appeared to be an unprovoked attack at an Amtrak station east of downtown, Michael Joseph Fobbs Jr.'s demeanor seemed to change, witnesses said.

He went from angry to “calm and detached” as he retrieved a new shirt from his luggage and changed out of his blood-covered garments in the station's bathroom, witnesses told police.

Fobbs, 21, was charged Thursday with murder. He remained at Bexar County Jail Monday in lieu of $150,000 bail.

Two passengers waiting for the next train told police they saw Fobbs, of Cibolo, pacing back and forth angrily just before 11 p.m. Thursday.

The witnesses reported Fobbs gave them “an angry look” several times, prompting one to ask Fobbs if there was a problem. Fobbs walked away and then entered and exited the waiting area several times, still apparently angry, the witnesses told police.

When he went outside the third time, he started pummeling a man, 56, who had been sitting on a bench, according to police.

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A witness said the man on the bench “was just sitting there” when Fobbs began punching him. Authorities have not yet released his identity, pending notification of next of kin.

San Antonio police officers arrived and reported Fobbs was “very calm and was cooperative, but appeared void of expression and emotion.” Fobbs told police he felt threatened by the man on the bench, but that the man had done “nothing” to make him feel that way.

Fobbs then said that he hit the man first so the man would not have a chance to hurt him.

Police wrote in a report that Fobbs “did not appear to be in a normal state of mind, and appeared detached from the incident that just happened.” Fobbs told police he did not have any mental disabilities.

Amtrak spokesman Marc Magliari did not say if Fobbs or the man who died were passengers. But in an emailed statement, Magliari wrote that “information about individual travel plans has been given to the police as we assist in their investigation.”

According to the Amtrak website, the Sunset Limit train, which runs east and west, arrives at the station at 4:50 a.m. on Fridays and departs a few hours later, at 6:25 a.m. The Texas Eagle route, which travels north and south, arrives at the station at 4:05 a.m. on Fridays and leaves at 7 a.m.

The westbound Texas Eagle train stops at the station at 9:55 p.m. every day.